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Influence of uncertainty measurements on evaluation of conformity for medical devices

Authors: Kosheva, Larysa; Onykiienko, Yurii; Pavlov, Yevhen;

Influence of uncertainty measurements on evaluation of conformity for medical devices

Abstract

The requirements of international documents for assessing the conformity of products to their established requirements are considered, taking into account the uncertainty of the results evaluated during the tests. The method of estimating the uncertainty of the result during the test on the example of a child incubator for newborns is developed. It has been shown that in order to be more likely to decide on conformity, it is necessary to analyze the factors of influence on the uncertainty of the result and to consider only those that do not provide normal testing conditions and can significantly distort the real results. Approaches to take into account the estimated uncertainty of measurement results in the assessment of conformity are shown. For products of a regulated field, that includes medical products, the recommendations for the decision rule applying are based on the calculation of the probability of compliance and the probability of two types of false decisions based on the density of the probability distribution of valuesof the measured value, the limits of the tolerance interval and the acceptance interval. It is shown that in order to ensure the established risk probabilities and increase the probability of decision-making use guard band, the length of which is associated with standard uncertainty, and the location - with the nature of the false decision.

Розглянуто вимоги міжнародних документів до оцінювання відповідності виробів встановленим вимогам до них з урахуванням невизначеності результатів, оцінюваної при випробуваннях. Розроблено методику оцінювання невизначеності результату при проведенні випробування на прикладі дитячого інкубатору для новонароджених. Показано, що для більшої вірогідності ухвалення рішення про відповідність необхідно аналізувати фактори впливу на невизначеність результату. Показані підходи для врахування оціненої невизначеності результатів вимірювань при оцінці відповідності. Показано, що для забезпечення встановлених ймовірностей ризиків та підвищення вірогідності прийняття рішення застосовують захисні смуги, довжина яких пов’язана із стандартною невизначеністю, а місце розташування – із характером помилкового рішення

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Keywords

uncertainty of measurement; conformity assessment; test; probability of decision making; decisive rule; tolerance interval; acceptance interval; guard band, 615.417:616-053.2:006.063, невизначеність вимірювання; оцінка відповідності; випробування; вірогідність ухвалення рішення, вирішальне правило, поле допуску, приймальні границі, захисна смуга

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold